About 60% of Delta Attendants Signed Cards Requesting Vote on Joining International Association of Machinists

Delta Air Lines Inc. flight attendants, a big nonunion group that has attracted much union organizing effort over the years but failed to vote for representation, potentially is back in play.

The International Association of Machinists union said Tuesday that nearly 12,000 Delta attendants, or about 60% of the entire group, have signed cards requesting that federal mediators conduct an election in which they could choose to join the IAM, leaving behind their nonunion status. An election victory for more than 20,000...